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A2. Examples of results for different alloy compositions
Jewellery pieces can consist of up to six (sometimes more) alloy components. Classically, the
metals used in jewellery production are gold, silver, copper, palladium, platinum, nickel and zinc.
The number of metals used depends on many factors, including the desired properties of the
jewellery, such as hardness, resistance, color, gleam, etc. Since jewellery can be made of a wide
variety of alloys, not every piece of jewellery with the same gold content will behave the same.
This is one of the reasons why the CaratScreenPen has gray transition ranges in addition to the
black measurement ranges and no fixed values of the gold content for the individual carat
numbers. The examples in the following tables illustrate this fact.
Table 1: Selected alloys of 3 metals with the corresponding carat number and observed result of
the CaratScreenPen.
Au
Ag
58.5
35.2
58.5
25
55
14.2
75
10.6
93.5
0.4
72.7
15.6
89.1
1.6
Table 2: Selected alloys of 4 metals with the corresponding carat number and observed result of
the CaratScreenPen.
Au
Ag
58.5
13.8
58.5
31.5
58.5
30.5
58.5
-
75
15.5
38
10.2
33.2
57
Table 3: Selected alloys of 5 or more metals with the corresponding carat number and observed
result of the CaratScreenPen.
Au
Ag
58.5
4.8
58.5
26
37.5
28.4
75.5
1.8
50
30
58.5
10.9
Pd
Cu
Ni
-
-
-
16.4
-
30
-
14.4
-
6
-
11.7
-
8.9
Pd
Cu
Ni
-
22.8
-
10.2
0.6
6.4
4
-
24.1
8.3
-
8.5
0.5
-
47.4
-
6.5
Pd
Cu
Ni
-
16.7
9.6
12.9
2
-
30.6
0.1
-
4.9
11.4
-
2.4
5.4
17.6
11
0.7
Zn
Pt
-
3
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Zn
Pt
-
4.3
-
-
-
-
-
-
9.2
-
-
-
-
3.5
-
-
3.3
-
Zn
Pt/Cd
10.1
-
1
-
-
2.8
-
6
-
7.9
3.6 Cd
-
0.3 Cd
Carat number
Result
14
14
14
14
13.2
14
18
18
22.4
21
17.4
18
21.4
21
Carat number
Result
14
14
14
14/18
14
18
14
14
18
18
9
8
Carat number
Result
14
14
14
18
9
18
18
12
14
18
14
9
9
9
35
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